Chen Yongxi, Cheng Min, Lai Cui, Wei Zhen, Zhang Gaoxia, Li Ling, Tang Chensi, Du Li, Wang Guangfu, Liu Hongda
College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control of Ministry of Education, Hunan University, Changsha, 410082, China.
Carbon Neutrality Research Institute of Power China Jiangxi Electric Power Construction Co., Ltd., Nanchang, 330001, China.
Small. 2023 Apr;19(14):e2205902. doi: 10.1002/smll.202205902. Epub 2023 Jan 2.
Recently, graphitic carbon nitride (g-C N ) has attracted increasing interest due to its visible light absorption, suitable energy band structure, and excellent stability. However, low specific surface area, finite visible light response range (<460 nm), and rapid photogenerated electron-hole (e -h ) pairs recombination of the pristine g-C N limit its practical applications. The small size of quantum dots (QDs) endows the properties of abundant active sites, wide absorption spectrum, and adjustable bandgap, but inevitable aggregation. Studies have confirmed that the integration of g-C N and QDs not only overcomes these limitations of individual component, but also successfully inherits each advantage. Encouraged by these advantages, the synthetic strategies and the fundamental of QDs/g-C N composites are briefly elaborated in this review. Particularly, the synergistic effects of QDs/g-C N composites are analyzed comprehensively, including the enhancement of the photocatalytic performance and the avoidance of aggregation. Then, the photocatalytic applications of QDs/g-C N composites in the fields of environment and energy are described and further combined with DFT calculation to further reveal the reaction mechanisms. Moreover, the stability and reusability of QDs/g-C N composites are analyzed. Finally, the future development of these composites and the solution of existing problems are prospected.
近年来，石墨相氮化碳（g-C₃N₄）因其可见光吸收性能、合适的能带结构和优异的稳定性而受到越来越多的关注。然而，原始g-C₃N₄的低比表面积、有限的可见光响应范围（<460 nm）以及光生电子-空穴（e⁻-h⁺）对的快速复合限制了其实际应用。量子点（QDs）的小尺寸赋予了其丰富的活性位点、宽吸收光谱和可调节带隙等特性，但不可避免地会发生聚集。研究证实，g-C₃N₄与QDs的整合不仅克服了单个组分的这些局限性，还成功地继承了各自的优势。受这些优势的鼓舞，本文综述简要阐述了QDs/g-C₃N₄复合材料的合成策略和基本原理。特别地，全面分析了QDs/g-C₃N₄复合材料的协同效应，包括光催化性能的增强和聚集的避免。然后，描述了QDs/g-C₃N₄复合材料在环境和能源领域的光催化应用，并进一步结合密度泛函理论（DFT）计算以进一步揭示反应机理。此外，还分析了QDs/g-C₃N₄复合材料的稳定性和可重复使用性。最后，对这些复合材料的未来发展以及现有问题的解决方案进行了展望。
